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【单选题】
可编程序控制器基本结构包括（）。 ①中央处理单元（CPU）； ②存储器； ③输入/输出模块（I/O）； ④编程器； ⑤电源； ⑥指示灯。A.
①②③⑤
B.
②③⑤⑥
C.
①②④⑤
D.
②④⑤⑥
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皮皮学刷刷变学霸
举一反三
【单选题】Not unti his fellows criticized him _______ to admit his mistake.
A.
does he begin
B.
did he begin
C.
began he
D.
had he begun
【单选题】听力原文：W: Bob, are you going straight home after school today? M: No, I have a class until one o'clock and after that I'm going to spend a couple of hours at the library before going home. When is Bob g...
A.
Around 3:00.
B.
At 1:00.
C.
At 2:00.
D.
He is not sure.
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